I'm just playing devil's advocate here but - If you control the people that run the capital flight operation, then you control who can flight capital. That may be appealing to you if you're a high enough power and want to be able to move your capital but not let the peasants do it.

Partial escape makes all those bribes and paid money for loyalty worth anything.

Otherwise, there is no justice system, so even a billionaire can vannish over night, making all the money in the world worthless. What good is it to be a party official, if you can not garantee that your children and spouse are in safety and better off at least.